Android 底部导航栏界面(Fragment)

        最近在做项目时，需要实现底部导航栏界面，在查找了一些资料及前辈写的代码后，自己实现了界面，如下图所示：

                                        

  完成如上图所示的丢导航栏界面有很多种方法，因为本人的能力问题，目前只知道两种，一种为ViewPager,另一种则为Fragment，此次在这里讲解的是Fragment实现底部导航栏的方法。 

  Fragment如何产生，什么是Fragment，Fragment生命周期，如何静态和动态使用Fragment，Fragment回退栈，Fragment事务，以及Fragment的一些特殊用途，例如：没有布局的Fragment有何用处？Fragment如何与Activiy交互？Fragment如何创建对话框？Fragment如何与ActionBar集成等等...在此我不做特别的讲解，可以看如下的网址：http://www.cnblogs.com/Gaojiecai/p/4084252.html,在此我只讲解此界面是如何做成的。

 1 总体框架：

                                                    

  2 布局文件：

     activity_main.xml   

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >        <FrameLayout                    android:id="@+id/content"                android:layout_width="match_parent"                android:layout_height="0dp"                android:layout_weight="1"                      ></FrameLayout>        <LinearLayout                        android:layout_width="wrap_content"                   android:layout_height="60dip"                   android:background="@drawable/black"                         >       <RelativeLayout                           android:id="@+id/date"                       android:layout_width="0dp"                       android:layout_height="match_parent"                       android:layout_weight="1"                      >           <LinearLayout                       android:layout_width="match_parent"                      android:layout_height="wrap_content"                      android:layout_centerVertical="true"                      android:orientation="vertical"                       >               <ImageView                             android:id="@+id/datephoto"                          android:layout_width="wrap_content"                          android:layout_height="wrap_content"                          android:layout_gravity="center_horizontal"                          android:clickable="true"                          android:background="@drawable/change_photo" />               <TextView                                  android:id="@+id/datezi"                             android:layout_width="wrap_content"                             android:layout_height="wrap_content"                             android:layout_gravity="center_horizontal"                             android:text="日期"/>           </LinearLayout>       </RelativeLayout>        <RelativeLayout                           android:id="@+id/find"                       android:layout_width="0dp"                       android:layout_height="match_parent"                       android:layout_weight="1"                      >           <LinearLayout                       android:layout_width="match_parent"                      android:layout_height="wrap_content"                      android:layout_centerVertical="true"                      android:orientation="vertical"                       >               <ImageView                             android:id="@+id/findphoto"                          android:layout_width="wrap_content"                          android:layout_height="wrap_content"                          android:layout_gravity="center_horizontal"                                                    android:clickable="true"                          android:background="@drawable/change_photo1" />               <TextView                                  android:id="@+id/findzi"                             android:layout_width="wrap_content"                             android:layout_height="wrap_content"                             android:layout_gravity="center_horizontal"                             android:text="留言"/>           </LinearLayout>       </RelativeLayout>               <RelativeLayout                                      android:id="@+id/message"                                  android:layout_width="0dip"                                  android:layout_height="wrap_content"                                  android:layout_weight="1">              <LinearLayout                                     android:layout_width="match_parent"                                 android:layout_height="wrap_content"                                 android:layout_centerVertical="true"                                 android:orientation="vertical">                                    <ImageView                             android:id="@+id/messagephoto"                          android:layout_width="wrap_content"                          android:layout_height="wrap_content"                          android:layout_gravity="center_horizontal"                          android:layout_marginTop="4.5dip"                          android:clickable="true"                          android:background="@drawable/message1" />               <TextView                                  android:id="@+id/messagezi"                             android:layout_width="wrap_content"                             android:layout_height="wrap_content"                             android:layout_gravity="center_horizontal"                             android:text="消息"                             android:textColor="#82858b"/>                                                  </LinearLayout>                                            </RelativeLayout>               <RelativeLayout                           android:id="@+id/set"                       android:layout_width="0dp"                       android:layout_height="match_parent"                       android:layout_weight="1"                      >           <LinearLayout                       android:layout_width="match_parent"                      android:layout_height="wrap_content"                      android:layout_centerVertical="true"                      android:orientation="vertical"                       >               <ImageView                             android:id="@+id/setphoto"                          android:layout_width="wrap_content"                          android:layout_height="wrap_content"                          android:layout_gravity="center_horizontal"                          android:clickable="true"                          android:background="@drawable/change_photo2" />               <TextView                                  android:id="@+id/setzi"                             android:layout_width="wrap_content"                             android:layout_height="wrap_content"                             android:layout_gravity="center_horizontal"                             android:text="设置"                             android:textColor="#82858b"/>           </LinearLayout>       </RelativeLayout>                </LinearLayout></LinearLayout>

  另外四个为Fragment布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >            <TextView                               android:layout_width="wrap_content"                           android:layout_height="wrap_content"                           android:text="哈哈哈"                           android:textSize="25sp"/>   </LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >        <TextView                               android:layout_width="wrap_content"                           android:layout_height="wrap_content"                           android:text="还好还好\(^o^)/~"                             android:textSize="25sp"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"     android:background="#DCDCDC">            <TextView                               android:layout_width="wrap_content"                           android:layout_height="wrap_content"                           android:text="这时Fragment"                             android:textSize="25sp"/>            </LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:background="#DCDCDC"     >                                <TextView                               android:layout_width="wrap_content"                           android:layout_height="wrap_content"                           android:text="sdfsdfsdfds"                             android:textSize="25sp"/>         </LinearLayout>

3 实现逻辑功能的.java文件

   MainActivity.java

  实现了对Fragment的显示，加载，隐藏

  

package com.example.textfragement;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.support.v7.app.ActionBarActivity;import android.graphics.Color;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends FragmentActivity implements OnClickListener {    /*----用于展示动态的fragment*/  private dateFragement showdate;  private findFragment  showfind;  private setupFragment showsetup;  private messageFragment showmessage;    /*-------用于的界面布局  ---------*/    private View  datelayout;    private View  findlayout;    private View setupolayout;    private View messagelayout;      private ImageView  one1;    private ImageView  two1;    private ImageView  three1;    private ImageView  four1;    private TextView   one;    private TextView   two;    private TextView   three;    private TextView   four;                         private FragmentManager frangementmanager; //用于对fragement处理    @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);      frangementmanager =   getSupportFragmentManager() ;init();setTabSelection(0);}public void init(){datelayout = findViewById(R.id.date);findlayout = findViewById(R.id.find);setupolayout = findViewById(R.id.set);messagelayout = findViewById(R.id.message);one = (TextView)findViewById(R.id.datezi);two = (TextView)findViewById(R.id.findzi);three = (TextView)findViewById(R.id.setzi);four = (TextView)findViewById(R.id.messagezi);one1 =(ImageView)findViewById(R.id.datephoto);two1 =(ImageView)findViewById(R.id.findphoto);three1 = (ImageView)findViewById(R.id.setphoto);four1 = (ImageView)findViewById(R.id.messagephoto);datelayout.setOnClickListener(this);findlayout.setOnClickListener(this);setupolayout.setOnClickListener(this);messagelayout.setOnClickListener(this);}//选择不同的底部导航public void  setTabSelection(int index){  FragmentTransaction trans = frangementmanager.beginTransaction();  clearselection();     //清除掉所有选中状态  hideFragements(trans);    //将所有fragement 置于隐藏状态  //显示动态内容  switch (index) {   case  0:   one.setTextColor(Color.GREEN);   one1.setImageResource(R.drawable.date1);;if(showdate == null){showdate = new dateFragement();trans.add(R.id.content, showdate);}else{trans.show(showdate);}trans.commit();                 break;       case 1:   two.setTextColor(Color.GREEN);   two1.setImageResource(R.drawable.find1);   if(showfind == null){showfind = new findFragment();trans.add(R.id.content, showfind);}else{trans.show(showfind);}   trans.commit();break;   case  2:   three.setTextColor(Color.GREEN);   three1.setImageResource(R.drawable.set1);if(showsetup == null){showsetup = new setupFragment();trans.add(R.id.content, showsetup);}else{trans.show(showsetup);}trans.commit();break;   case 3 :   four.setTextColor(Color.GREEN);   four1.setImageResource(R.drawable.message);   if(showmessage == null){   showmessage = new messageFragment();   trans.add(R.id.content, showmessage);   }   else{ trans.show(showmessage);   }       trans.commit();       break;   }}//清除掉所有的选中状态public void clearselection(){one.setTextColor(Color.WHITE);two.setTextColor(Color.WHITE);three.setTextColor(Color.WHITE);four.setTextColor(Color.WHITE);one1.setImageResource(R.drawable.date);two1.setImageResource(R.drawable.find);three1.setImageResource(R.drawable.set);four1.setImageResource(R.drawable.message1);}//将所有fragement 置于隐藏状态public void hideFragements(FragmentTransaction transaction){if (showdate != null) {              transaction.hide(showdate);          }          if (showfind != null) {              transaction.hide(showfind);          }          if (showsetup != null) {              transaction.hide(showsetup);          }          if(showmessage != null){        transaction.hide(showmessage);          }       }@Overridepublic void onClick(View  v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.date: setTabSelection(0); break;case R.id.find: setTabSelection(1); break;case R.id.set: setTabSelection(2); break;case R.id.message:setTabSelection(3);break;    }}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}}

另外四个.java文件主要是调相对的界面文件：

 

package com.example.textfragement;import java.io.IOException;import java.util.zip.DataFormatException;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.Toast;public class dateFragement   extends Fragment implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stub}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubView   datafragment = inflater.inflate(R.layout.date_layout, container,false);return datafragment;}        }

package com.example.textfragement;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.graphics.Color;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.widget.GridView;import android.widget.SimpleAdapter;import android.widget.TextView;import android.widget.Toast;public class findFragment  extends Fragment {      public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubView   findfragment = inflater.inflate(R.layout.find_layout, container,false);return findfragment;}}

在此我只写了两个Fragment的调用java文件，另外两个大家可以模仿着写。以上就是程序的核心代码，简单清晰，适合大家学习，如果有什么好的代码，也希望能分享给我，大家互相学习。源代码地址:

http://download.csdn.net/detail/danielntz/9411271